Methods, apparatuses and system for monitoring ROADM optical network

Abstract

Provided are methods, apparatuses and a system for monitoring a Reconfigurable Optical Add Drop Multiplexer (ROADM) optical network. The method includes: loading, in an optical signal at a sending end, a wavelength label frequency and attribute information of a channel used for transmitting the optical signal; sending the wavelength label frequency and/or the attribute information; receiving, at a monitoring end, the optical signal and acquiring, from the optical signal, the wavelength label frequency and/or the attribute information of the channel used for transmitting the optical signal; and monitoring the ROADM optical network according to the wavelength label frequency and/or the attribute information. The technical solution solves the technical problem in related art that the ROADM optical network cannot be effectively monitored, and achieves the effective monitoring of the ROADM optical network.

What is claimed is: 
     
       1. A method for monitoring a Reconfigurable Optical Add Drop Multiplexer (ROADM) optical network, comprising:
 acquiring from an optical signal, a wavelength label frequency, or the wavelength label frequency and attribute information of a channel used for transmitting the optical signal; and 
 monitoring the ROADM optical network according to the wavelength label frequency or according to the wavelength label frequency and the attribute information; 
 wherein monitoring the ROADM optical network according to the wavelength label frequency and/or the attribute information comprises at least one of the following: judging whether there is an optical signal misconnection on a path of the ROADM optical network according to the wavelength label frequency and/or the attribute information;detecting, at where the optical signal is dropped, whether a coherent receiver matches an optical channel of the dropped optical signal according to the wavelength label frequency and/or the attribute information; generating an optical network configuration requirement according to the wavelength label frequency and/or the attribute information, and comparing the optical network configuration requirement with configuration information sent by a network management system to judge whether network management information received by a current node is abnormal. 
 
     
     
       2. The method as claimed in  claim 1 , wherein the attribute information comprises at least one of the following: width of the channel, location of the channel, whether the channel has subcarriers, distribution of the subcarriers, source address, destination address, modulation format, subcarrier multiplexing mode and signal rate. 
     
     
       3. The method as claimed in  claim 1 , wherein before acquiring the wavelength label frequency and/or the attribute information, the method further comprises:
 transmitting the attribute information on a wavelength label channel. 
 
     
     
       4. The method as claimed in  claim 1 , wherein detecting, at where the optical signal is dropped, whether the coherent receiver matches the optical channel of the dropped optical signal according to the wavelength label frequency and/or the attribute information comprises:
 detecting the wavelength label frequency of the optical signal to obtain, by analysis, at least one of the following: distribution of subcarriers and wavelengths, modulation format, subcarrier multiplexing mode and signal rate carried in the wavelength label frequency; 
 comparing the attribute information and the distribution of the subcarriers and/or the wavelengths obtained by analysis with a spectrum emitted by a laser at a monitoring end, to judge whether a local oscillation frequency of a coherent receiver at the monitoring end matches a spectrum of the dropped optical signal, when it is judged that the local oscillation frequency of the coherent receiver at the monitoring end does not match the spectrum of the dropped optical signal, determining that a subcarrier scheduling error occurs during transmission of the optical signal or the optical signal emitted by the laser is erroneous; and/or comparing the attribute information and at least one of the modulation format of the optical channel, the subcarrier multiplexing mode and the signal rate obtained by analysis with at least one of a corresponding demodulation format, subcarrier multiplexing mode and signal rate contained in configuration information received by the monitoring end from the network management system, to judge whether configuration of a sending end matches configuration of a receiving end; when it is judged that the configuration of the sending end does not match the configuration of the receiving end, determining that there is an error in transmission of network management information or the configuration information sent by the network management system is erroneous. 
 
     
     
       5. The method as claimed in  claim 1 , wherein judging whether there is an optical signal misconnection on the path of the ROADM optical network according to the wavelength label frequency and/or the attribute information comprises:
 detecting the wavelength label frequency of the optical signal to obtain, by analysis, distribution of subcarriers and/or wavelengths carried in the wavelength label frequency; 
 comparing the distribution of the subcarriers and/or the wavelengths obtained by analysis with the attribute information, to judge whether there is an optical signal misconnection. 
 
     
     
       6. The method as claimed in  claim 1 , wherein judging whether there is an error in the transmission of the network management configuration information on the path of the ROADM optical network according to the wavelength label frequency and/or the attribute information comprises:
 detecting the wavelength label frequency of the optical signal to obtain, by analysis, at least one of the following: distribution of subcarriers and wavelengths, modulation format of optical channel, subcarrier multiplexing mode and signal rate carried in the wavelength label frequency; 
 generating a configuration requirement of a current node according to the attribute information obtained by analysis, and comparing the configuration requirement with configuration information sent from the network management system to judge whether there is an error in the transmission of the network management configuration information; and/or judging whether a Digital Signal Processor (DSP) algorithm for drop reception is correct according to the attribute information. 
 
     
     
       7. The method as claimed in  claim 5 , wherein comparing the distribution of subcarriers and/or wavelengths obtained by analysis with the attribute information to judge whether there is an optical signal misconnection comprises at least one of the following:
 in a condition that the attribute information indicates that the optical signal carries N subcarriers on a first channel but the analyzed number of subcarriers on the first channel carried in the optical signal is less than N, determining that part of subcarriers on the first channel are lost, where N is a positive integer; 
 when the optical signal is dropped, judging, according to the wavelength label frequency and/or the attribute information, whether a site where the optical signal is dropped is the same as a destination site indicated by the attribute information; when it is judged that the site where the optical signal is dropped is not the same as the destination site indicated by the attribute information, determining that an error occurs in fibre connection or spectrum scheduling; 
 in a node in which the optical signal is transmitted, judging whether a configuration requirement of the node generated according to at least one of the distribution of subcarriers and wavelengths, modulation format of optical channel, subcarrier multiplexing mode and signal rate in the attribute information is the same as the configuration information sent by the network management system; when the configuration requirement of the node is not the same as the configuration information sent by the network management system, determining that the configuration information received by the node from the network management system is erroneous. 
 
     
     
       8. The method as claimed in  claim 1 , wherein monitoring the ROADM optical network according to the wavelength label frequency comprises: in a condition that the wavelength label frequency has a conflict, determining that spectrum of a same frequency has been scheduled into a same fibre. 
     
     
       9. The method as claimed in  claim 1 , wherein before acquiring the wavelength label frequency carried in the optical signal, the method further comprises:
 loading the wavelength label frequency to one or more subcarriers on the same channel in the optical signal, wherein each subcarrier on the same channel is loaded with the same wavelength label frequency, or, different subcarriers on the same channel are loaded with different wavelength label frequencies. 
 
     
     
       10. The method as claimed in  claim 9 , further comprising:
 after loading the wavelength label frequency to multiple subcarriers on the same channel in the optical signal, combining the multiple subcarriers, wherein different subcarriers on the same channel are loaded with different wavelength label frequencies; or, 
 before loading the wavelength label frequency to the multiple subcarriers on the same channel in the optical signal, combining the multiple subcarriers. 
 
     
     
       11. The method as claimed in any one of  claims 1  to  3  and  4  to  10 , wherein the ROADM optical network is a flexible ROADM optical network. 
     
     
       12. A method for monitoring a Reconfigurable Optical Add Drop Multiplexer (ROADM) optical network, comprising:
 Loading in an optical signal, a wavelength label frequency and attribute information of a channel used for transmitting the optical signal; 
 sending the wavelength label frequency and/or the attribute information, wherein the wavelength label frequency and the attribute information is used for monitoring the ROADM optical network; 
 wherein monitoring the ROADM optical network according to the wavelength label frequency and/or the attribute information comprises at least one of the following: judging whether there is an optical signal misconnection on a path of the ROADM optical network according to the wavelength label frequency and/or the attribute information;detecting, at where the optical signal is dropped, whether a coherent receiver matches an optical channel of the dropped optical signal according to the wavelength label frequency and/or the attribute information; generating an optical network configuration requirement according to the wavelength label frequency and/or the attribute information, and comparing the optical network configuration requirement with configuration information sent by a network management system to judge whether network management information received by a current node is abnormal. 
 
     
     
       13. The method as claimed in  claim 12 , wherein the attribute information comprises at least one of the following: width of the channel, location of the channel, whether the channel has subcarriers, distribution of the subcarriers, source address, destination address, modulation format, subcarrier multiplexing mode and signal rate. 
     
     
       14. The method as claimed in  claim 13 , wherein sending the wavelength label frequency and/or the attribute information comprises:
 sending the wavelength label frequency and/or the attribute information through a wavelength label channel. 
 
     
     
       15. An apparatus for monitoring a Reconfigurable Optical Add Drop Multiplexer (ROADM) optical network, comprising a hardware processor, configured to perform programming units stored in a memory, wherein the programming units comprise:
 an acquisition unit, which is configured to acquire, from an optical signal, a wavelength label frequency or the wavelength label frequency and attribute information of a channel used for transmitting the optical signal; and 
 a monitoring unit, which is configured to monitor the ROADM optical network according to the wavelength label frequency or according to the wavelength label frequency and the attribute information; 
 wherein the monitoring unit comprises at least one of the following: a first monitoring component, which is configured to judge whether there is an optical signal misconnection on a path of the ROADM optical network according to the wavelength label frequency and/or the attribute information; a second monitoring component, which is configured to detect, at where the optical signal is dropped, whether a coherent receiver matches an optical channel of the dropped optical signal according to the wavelength label frequency and/or the attribute information; a third monitoring component, which is configured to generate an optical network configuration requirement according to the wavelength label frequency and/or the attribute information, and compare the optical network configuration requirement with configuration information sent by a network management system to judge whether network management information received by a current node is abnormal. 
 
     
     
       16. The apparatus as claimed in  claim 15 , wherein the attribute information comprises at least one of the following: width of the channel, location of the channel, whether the channel has subcarriers, distribution of the subcarriers, source address, destination address, modulation format, subcarrier multiplexing mode and signal rate. 
     
     
       17. The apparatus as claimed in  claim 15 , wherein the programming units further comprise:
 a transmitting unit, which is configured to transmit the attribute information on a wavelength label channel, before the acquisition unit acquires, from the optical signal, the wavelength label frequency and/or the attribute information of the channel used for transmitting the optical signal. 
 
     
     
       18. An apparatus for monitoring a Reconfigurable Optical Add Drop Multiplexer (ROADM) optical network, comprising: a hardware processor, configured to perform programming units stored in a memory, wherein the programming units comprise:
 a loading unit, which is configured to load, in an optical signal, a wavelength label frequency and attribute information of a channel used for transmitting the optical signal; 
 a sending unit, which is configured to send the wavelength label frequency and/or the attribute information, wherein the wavelength label frequency and the attribute information is used for monitoring the ROADM optical network; 
 wherein monitoring the ROADM optical network according to the wavelength label frequency and/or the attribute information comprises at least one of the following: judging whether there is an optical signal misconnection on a path of the ROADM optical network according to the wavelength label frequency and/or the attribute information; detecting, at where the optical signal is dropped, whether a coherent receiver matches an optical channel of the dropped optical signal according to the wavelength label frequency and/or the attribute information; generating an optical network configuration requirement according to the wavelength label frequency and/or the attribute information, and comparing the optical network configuration requirement with configuration information sent by a network management system to judge whether network management information received by a current node is abnormal. 
 
     
     
       19. The apparatus as claimed in  claim 18 , wherein the attribute information comprises at least one of the following: width of the channel, location of the channel, whether the channel has subcarriers, distribution of the subcarriers, source address, destination address, modulation format, subcarrier multiplexing mode and signal rate. 
     
     
       20. The apparatus as claimed in  claim 18 , wherein the sending unit is configured to send the wavelength label frequency and/or the attribute information through a wavelength label channel. 
     
     
       21. A system for monitoring a Reconfigurable Optical Add Drop Multiplexer (ROADM) optical network, comprising the apparatus for monitoring the ROADM optical network as claimed in any one of  claims 15  to  17  and the apparatus for monitoring the ROADM optical network as claimed in any one of  claims 18  to  20 .